Mechanical movement.



W. H. WELCH. MECHANICAL MOVEMENT. APPLI ATION FILED JULY 9, 1913.

1,1 10,977, Patented Sept. 15,1914.

2 SHEETSSHEBT 1.

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W 71. Mela/z wuweww THE LORRIS PETERS CO, PHOTO-LITHO.. WASHINGTON, D. Cv

W. H. WELGH.

MECHANICAL MOVEMENT.

APPLICATION FILED JULY 9, 1913.

Patented Sept. 15,1914.

2 SHEETS-SHEET 2.

THE NORRIS PETERS 50.. PHOTO'LITHQ. WISHINGTON, D. C.

till) s'rarn rarer armors;

WILLIAM H. WELGI-I,

& ivmnurno'runine oonrnnr, or

or cnnvnnnnn, OI-IIO, lassionon TO THE CLEVELAND MACHINE GLEVELAND, OHIO, a conronnrron OF OHIO.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented Sept. as, role.

Application filed July 9, 1913. Serial No. 778,101.

To all whom it may concern:

Be it known that 1, WILLIAM H.WVEL0H, a citizen of the United States, residing at Gleveland, in the cou ty of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.

My invention relates to improvements in mechanical movements, and more particularly to that class or type wherein a reciprocatory movement is imparted by a continuously revolving crank or shaft and a'pause or dwell is desired during a portionof the revolution of the crank or shaft, or in other words,-wherein only during a certain portion of the revolution of the driving'or continuously revolving element is motion trans mitted to the reciprocating member.

The present embodiment of the invention is particularly designed and adapted for use in connection with drawing or stamping presses wherein the blank or sheet to be Operated upon is gripped against the die by a blank holder and held there during the operation of the plunger or male die.

In presses of this generalcharacter, the plunger or male die is usually connected to a crank on a driving shaft which at every operation of the press forces the plun ger down and lifts it again. The blank holder through which the plunger moves descends in advance of the plunger until it reaches the blank, andafter pressing and holding the latter firmlyv against the fixed die, itpauses or dwells in this position in order to firmly hold the blank during the action of the plunger and then ascends either with or immediately after the plunger to regain its normal elevated position. As is well known to those skilled in this art, this movement of the blank holder, being some what complicated, has usually been imparted by means ofcams, and the like, which, being subject to considerable wear result in the blank holder not being held firmly to its work. H

The primary object of this invention is to provide a generally improved and simplified mechanism for imparting the requisite movement to the blank holder through the medium of suitable intermediate connections such as the commonly employed oscillating levers connected by togglelinks to the blank holder so that as the lovers are vibrated to the slide is in the position cord to this are of dwell, and hence, during bring their arms in line to the direction of movement of the blank holder, and for operating these levers, a reciprocating slide is driven from the driving or crank shaft so that during a portion of the movement of the crank shaft (in the present instance during the major portion of its revolution) the main slide will act to communicate its movej ment to the levers, and when said main slide 1 and its connections have been moved to hold the blank holder to its stationary or holding position in contact with the stationary die,

. the movements of the crank shaft will serve only to hold the main slide and its connections in a stationary position in order to cause a pause or dwell of the blank holder in contact with the die.

From the above explanation it will be understood that while the present embodiment of the invention as illustrated and described herein is particularly designed and adapted for use in connection with drawing or stamping presses, the same may be readily applied and adapted for use in connection with various machines and devices where a similar or analogous movement is desired or required.

With the above mentioned and other ends view, the invention consists in the novel construction, arrangement, and combination of parts, hereinafter described, illustrated in one of its embodiments in the accompanying drawings, and particularly pointed out in the appended claims.

Referring to the drawings, forming a part of this specification, Figure 1,is a front elevation of the improved device or attachment as it would appear attached to the upper left-hand side of an ordinary drawing or stamping press. Fig. 2, a view of the inner side of same, showing the position of the toggle link and lever mechanism when the main slide is at the end of its stroke or in its extreme lowermost position and is about to be returned. Fig. 3, a similar view of the same when the slide is in its opposite position, the crank and lever and toggle link members being in theirinitial position, or in otherwords-in the position they occupy as the crank isabout to pass through its arc of dwell at its upper dead point while of a tangent or the swing of the crank through this are (in the present instance about one-quarter of the circle) no motion will be imparted to the slide. Fig. 4, a similar view showing the position of the crank and the lever and toggle link members at the end or conclusion of the arc of dwell.

Similar numerals of reference designate like parts throughout all the figures of the drawings.

The improved mechanical movement com-.

the main slide hereinafter described. being adapted;to-be-operatedby means of a driving: or crank shaft 2, the latter being provided with a crank armr2 ,said shaft 2,.be-. ing mounted, inthe presentinstance, inv a bearing arm. 1?. g

i The; support or frame 1,is provided with bearing or guide bracketsv 3, adapted; to guide. and support the main. slide 4,: inits reciprocatory. movements as actuated by. the lever and toggle link members hereinafter described. As a means, of compensating for the movements of the, lever member. 5, and thejtoggl e. link members 6, duringthe actuation ofthe latter throughv the, connecting links 7,.at. one end of the lever 5, and the revolution of the. crank arm 2 of the crank shaft 2, aguide. member. or auxiliary slide 8, isprovided, said guide. or auxiliary slide forming. a bearing for the. pivoted .portion 5 of the lever member and the pivotedlportion 6?, of one of. the togglelinks sothat said pivots or pins.5 ,.and 6, of the lever 5, and. the adj acent connecting link are held in fixed relation toeach other during the movements of the said lever andtogglelinkmemhers as clearly shown in Figs. 2, 3, and; 4, of the drawings.

As a meansfor guiding the auxiliary slide and guide and holding the same for vertical movement in alinement. with. the movements of the main slide 4, bearing. guide members 4*, are formed. integral with the main slide,.the:limits of-inovement of the auxiliary slide and guide being indicated by the ends of. said bearingi guides 4, and

the relative movements of said auxiliary slide. and guide. beingv indicatedv by the arrows in Figs. 2, 3, and .4, of the drawings illustratingthe movementsof the lever and toggle linkmembers, Figs. 3 and.4, showing thepo sition of. said. parts at the initial and terminating; portions of the arc. of. dwell, and the, dotted lines in Fig. 3, showing, the

position ofthe. parts when the crankarm 2 is at the center of the said are of dwell.

It will be. observed that the lower end. of .1

the lower toggle link 6, is pivotally connectedf to. the main slide 4, in the present instance, by means of a pivot pin 6 the latter being threaded in a threaded opening of a stud or boss 4, of the; main slide 4'. Itwillalsobe observed that the convnecting'links 7, are'pivotally connected by pivot or stud pins 7 a and 7 similar in shape to the pivot pins 5 6 and 6 the. pivotor stud pin 7', extending through the inner-or connecting ends of the toggle links 6,'and

through the ends of the connecting links 7, as shown most clearlyin' Fig. 1, of the drawings. 1

' From. the foregoing; description, taken in connection with the accompanying draw ings, the. operation and advantages of my invention will be. readily understood.

. Having thus; described one of the-embodiments of my invention, what I claim and desire to secure byLetters Patentis L111. a mechanical-.movement, a main slide, a. drivlng. shaft provided with a crank,

; a. movable guide or slide, a pair of toggle link. membersyfone' of which is connected to said guide or slide and. the otherof which isconnected to. saidmainslide, alever member pivotally mounted; on said. guide or slide and connected to said crank of said driving. shaft, and means. for connecting said lever. member to said toggle ;links.

' 2. A. mechanical movement, comprising a su) ort a. main, slide carried thereby a l 1 .7

crank shaft, an auxiliary slide adapted to reciprocate. inline-with said main. slide, a

Y lever member connectedto said crankshaft and fulcrumed to said. auxiliary slide, a pair of toggle linksone of -Whl0hiiS pivotally connected to said auxiliaryslide and. the other to said mainslide, and a connecting link. connecting saidlevermember tosaid toggle links..-

3.:In. a; mechanical movement, thecombinationwith amainslide. and an auxiliary slideradapted. to reciprocateflin a. common direction; of. a-driving shaft, and lever and toggle. link. ,members. pivotally connected to said auxiliary slide and. driving .jshaft and to said auxiliary slide and said gmainslide,

. respectively, said. lever member, and said toggle links being connected. along the common line. of thereciprocation ofsaidslides whereby said main slidegis causedto dwell during. a portion of the; revolution; of said driving shaft... a i

4:. In a mechanlcal movement, thefcombt.

nation. witha driving. shaft, ands a. main slide=and an auxiliary sl deniounted to redlrection; of a pair ciprocate in a common of togglelinks pivotally connected. at their outer. ends to said mainand auxiliary slides andin linewith the reciprocation ofthe;lat ter, and a lever member fulcnumed to sa d auxiliary. slide on. a line common to p vot.

.connectionsvatthe outer ends of said-toggle linksland. connected to" the inner ,ends. of the latter wherebysaid mainslide will'be caused 10 the direction of said main slide and connected at one end to said crank, and a link connected to said main slide and the opposite end of said lever.

In testimony whereof I have afi'iXed my signature in presence of tWo Witnesses.

WILLIAM H. WELOH.

Witnesses:

R. S. PIERCE, O. O. BILLMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 110. 

